KEY Command - Plus/4 Encyclopedia



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KEY Command
Category Reference/Commodore BASIC V3.5 Topic KEY [key#,string] The KEY command allows for redefining the actions of the 8 function keys. The HELP key is defined under KEY 8. The KEY command without parameters displays the current definitions of the function keys. To define special characters, use CHR$ codes (such as CHR$(13) for RETURN, or CHR$(34) for a double quote mark). The total combined length of all KEY definitions cannot exceed 128 characters. If you try to define a KEY which would exceed this, ?OUT OF MEMORY ERROR will occur. Try this example program: `10 FOR I = 1 TO 8 : KEY I, "" : NEXT I : REM CLEAR ALL KEY DEFINITIONS 20 FOR I = 1 TO 129 : A$ = A$ + "." : NEXT I : REM BUILD A 129 CHARACTER LONG STRING 30 KEY 1, A$` Line 30 will display an error. NB: if you change 129 to 128, the program will work. Examples `KEY` Displays current KEY definitions `KEY 1,""` 'Disable' F1 key, when pressed, nothing will happen. `KEY 2,"GRAPHIC 0"+CHR$(13)+"LIST"+CHR$(13)` Redefines F2 so that when pressed, causes the computer to select text mode and list the program in memory Notes The KEY data is stored from $055F (1375 decimal) in the memory. The first 8 bytes are key string lengths, followed by the strings. Abbreviation K SHIFT+E